The Pillars of Salt, located on Mahri Nui's underwater landmass, were mountains that formed over the centuries from salt deposits in the water. This area was a preferred hunting ground for Takea sharks, so the Matoran did not explore it extensively.1
Notes
The Pillars of Salt were a natural formation to the north of the village of Mahri Nui. They were the favorite hunting grounds of Pridak.2